"It's sort of a power thing. It's similar to the Eskimo kiss
where the noses touch, but they do this whole facial expression
showing power to each other," she said.

The trio will leave Australia on March 14, travelling through 18
countries in four months including New Zealand, Thailand, India,
Japan, the US, Peru, South Africa and Norway where they'll talk to
everyone from prostitutes to the average Joe.

"People are influenced by their environments, so people living
in different cities might kiss slightly differently," Hals
said.

"For example, in Norway, it's freezing cold and I do kiss less
in the winter time than I do in the summer time ... when it's nice
and warm."